engine light on in my 2005 pontiac grand prix

5

Asked by Apr 07, 2012 at 02:14 PM about the 2005 Pontiac Grand Prix Base

Question type: Maintenance & Repair

how do i fix it without paying $100 for a garage to tell me my gas cap was looses....i replaced the gas cap and reset the computer by pulling the bttery cables off,,,yet, the engine light is still on,,,car runs like mint

5 Answers

13,265

You can't reset the codes on this car by unhooking the battery but the following procedure will work to reset DTC codes........ Remove only the battery positive cable. Insert key in ignition and take key to full engine start position and hold there for at least 1 minute. (Of course, engine will not start and no instrument lights). Take key back to off, however, it will not remove at this time and be stuck. No problem. Next re-connect battery positive cable. You will hear relays chatter. Now turn key forward and back. It will now remove. Finally, start engine. SES light should be off and all DTC error codes cleared. PCM should now be in re-learn mode. If you have an ongoing problem the light will come back on in one to three cycles.

18 of 18 people found this helpful.
Best Answer Mark helpful
5

thnx,,,i'll try that tomorrow thanks again

its either that ^ or get a scan tool to read the problem if it comes back.

2 of 2 people found this helpful.
20

Sensor below the gas intake needs replaced. It is not the gas cap.

2 of 2 people found this helpful.

I have the same problem it's a fuel pressure regulator. It tells your gas tank the proper pressure hence when it's not working the pressure is to low so the computer thinks the has cap is loose.

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